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@gotten tutes gsicut @time JOHN A. 'lllOrlPSON OF-..\UBURN, NEW YGRK, ASSIGNQR TO IIIMSELF AND LORENZ() W. NYE, 0F SAME PLACE.

Letters Patent No. 75,709, daccl Pfmch 17, 1868.

Litige rlgrtnlr ninna tain their das hnelt mit mating uit nf ilgesnmc.

De it known that I, JOHN A. TIIOMPSON, ofthe city of Auburn, in the county' el' Cayuga, and State of New York, have invented a new and useful Improvement on a. GrindingIach-lne; and I do hereby declare that the following is a clear, full, and exact description ol` the construction and operation of the same, rel'erencebeing had to the annexed drawings, making` a part of Athis specification, in which- I Figure 1 is a perspective view.

Figure 2 is a sectional view of the pedestal and hase.

Figure 3 is a view oi' a rcaper-section and protective hood.

Figure 4 isa section of stone, shaft, crank, and its bearings.

Figure 5, a section of shaft, crank, and spring-key.

Figure 6 is av transverse section of rest, section-bar, and hood.

Figure 7 is a similar section, to show a rotary guard, audits attachment te the barsupport, and its rotation on the sid-e of the stone.

A, grindstone, which should he dressed true on its face and sides, at a right angle with the face; B, shaft;

C, crank; D,ihearing; E, frame; F, hase;` Gr, pedestal; 1I H, elastieclarnps; I, supporting-bar; 'il' JJJ,

toggle-joints; K, bar for support of sections, or articles to be ground; L, rea-per-bar and sections; M, hood or guard; N, rotary guide-guard; O, thimhle or socket of metal; I, urnsupport or stand; Q, urn; R', water-. guides; S, water-basins; T, bolts and thumb-screw; U, slot; V, lugs. Y i

'Io grind truly and properly, the set of sections or shear-blades of a reaping or mowing-machine requires that they should rnove in delinite linesupon the stone while 'being ground. To accomplish this requires that the machine be so eonstructed'that its movements and operations shall be subjectto the control of the operator. On this account the bank of sections is presented to demonstrate the exact operations of the various parts of the machine.

y I propose to construct -the frame et' this machine of angle-iron, or of wood in same form, in order to secure greater lirmness and safety in transporting. The frame E is firmly riveted together at its angles, and the 'thimhle O is riveted in position, in the corner, to the rail and cross-tie. The leg being turned to'it thssocket,

is readily held by wood-screw passing through thimble into log. P, a support for the water-urn; this may he held firm to frame hy means of bolt or socket. The urn Q should be furnished with a. faucet, so as to regulate the supply of water, to keep the stone on face or 'side clean. This water flowing from the stone is conveyed by the'cnductors orgudes'R from the stoneinto water-basinS.

I construct the foot or base, F, ofthe pedestal of irm, hard wood, provided with a slot, as shown in g. 2 atU, through which the holt T passes into the plank-tic in frame, hy which means it may be moved'from or towards the stone, or he rotated from side to side of the stone, and held firm in any desired position by bringing down the thumb-screw. A small bolt or rivet should be passed through the ends ofthe base, to prevent the slot splitting out. 'I attachr by two screws or by bolt, two strips of band-iron, or other suitable material, `to form the sides of elbow-joint connection with the pedestal G, the lower end oi' which is rounded from its back forward, as shewnin section, iig. 2. The upper cud of the pedtal is rounded from side tosde, which allows the supporting-har I to he tilted or tipped at any anglo. 'The sides of this connection are also of wrought metal, elastic, so thebar can he rotated or held {irm by the screw and bolt. I attach tothe supporting-har I the lower ends of the toggle-joints@ which should be made of cold-drawn iron or steel, in 'orderto be light and firm'. These are connected by thumb-screws, so as to be held firm, or moved, as desired.

'.llhehar K, for supporting:r the sections or articles to be ground, is ploughed in L forn1, or made of angleiron, through which bolts with lug-endsaro passed, and held iirzn against the section-bar and the L-bar. The sectionhar can slide or be moved readily on this way and the lugs.

'.lhe hood or'guard M should be constructed from copper, brass, or such metal as will not injure the edge of the knife or section, and in angle or such form as will tit upon the section, and `may be held by clampinhthe lower edge of the section, or by a pin, as represented in section, fig. 3. Fig. "Tshows a guard, with'a roller mounted in a frame made of wrought metal or malleable metal, attached, by lug and thumb-screw, tocuttcnbar and its support, which is placed so as to protect the knife or section from coming in contact with the stone to its injury, the roller moving readily upon the sides or face oi' the stone. This guide-roll maybe made of rubber, iron, wood, or other suitable material.

The shaft B is so made as to receive the crank Cv readily upon either end, so it may be shifted from side to side, out of the way of the sections, as required. The crank may he attached te shaft, by means of n. springkey or nut.

The operation of this machine is.seen clearly in draught. The bar of sections is placed on the way-lugs, and the knife to he ground brought in cont-act with the stone, commencing grinding at its lower angle, thc hevel lying true upon the stone, which is readily accomplished by a turn of screw-holding base; move this up or bock from stone or to side, and then fasten by turning nut at base of the pedestal, and carry the sections to the stone; turn upon nut, and tilt the supporting-bar t0 right point, so as to place all as desired, and fasten firmly new by'mea-ns of toggle-joints. The upper bar may be depressed, or may be carried to/right orleft, so as to causethe knife to move in all required lines upon the face or sides ofthe stone,so with ordinary care and skilis. proper edge can be secured.'

Claims.

What I claim, and desire to secure by Letters Patent,`is 1. In combination with the movable hase F, pedestal G, and tilting supporting-bar I, the elastic clamps H II, with thumb-screw and bolt T, forming movahlejoints, for the purposes set forth.

2. The connection ofthe supporting-har I, by the toggle or elbow-joints J J J J, with har K. 3. The hood-guard M and the rotary guard N, as and for purposes'spccified. 4. The tliimble O and angular frame E, all combined and operating in manner. substantiallyY as set forth, and for the purposes specified.

AIn testimony that I claim the foregoing, I hereunto aiX my signature, in presence of- JOHN A. THOMPSON.l Witnesses:

J. F. CALLAN, lA. R. ALLEN. 

